Struggling with Saying No and Hearing No

A lot of people have problems with the word no, and it’s not necessarily a function of illness of any kind. My guess is that if you say yes to yourself about certain things, inner child type things, like giving yourself permission to play, spending time baking oatmeal cookies or something like that, hanging out with a good friend who will indulge you to a certain degree, and also setting and enforcing good strong boundaries, those things should help

✋ It has gotten me in trouble several times because I don't know when to firmly say no, especially to those I am close to.

I don't have a support system. I am in thearpy but they don't know either issue. I was 53 , last year, before I heard the term splitting. Been doing it forever but had no idea why.